Triterpenoids and compositions containing the same

A triterpenoid compound of the structure of Formula X, Formula XI, Formula XII or Formula XIII:

• R11 and R12 are each independently hydrogen, hydroxyl, halo, alkyl, alkenyl, alkynyl, aryl, aralkyl, heteroaryl, heteroaralkyl, acyl, alkoxy, aryloxy, aralkoxy, heteroaryloxy, hetero-aralkoxy, acyloxy, alkylamino, dialkylamino, arylamino, aralkylamino, heteroarylamino, heteroaralkylamino, amido, or a substituted version of any of these groups, or
• R11 and R12 are taken together and are alkanediyl, alkenediyl, arenediyl, alkoxydiyl, alkenyloxydiyl, alkylaminodiyl, alkenylaminodiyl, or alkenylaminooxydiyl;
• X is ═O or —OMe;
• dashed bonds are present or absent;
• R26 and R27 are independently a hydrogen, halo, alkylthiyl, or substituted or unsubstituted alkylsulfonyl or alkylsulfonyl-O—;
• and
• R28 and R29 are independently —H, or together are ═O.